Electric filament lamp or discharge lamp

ABSTRACT

An electric filament or gas discharge lamp comprising a tubular glass lamp vessel which is sealed at one end by a pinch seal and has a number of filaments or electrodes supported by stiff current conductors or members. The conductors or members are passed through a common transverse support and are secured to a metal foil connection outside of the pinch seal and preferably in the space of the lamp vessel.

United States Patent 1 1 Huyskens 1 1 May 29, 1973 DISCHARGE LAMP [75]Inventor: Johan Elisa Lambert Cornelis UNITED STATES PATENTS Huyskens,Emmasingel. Eindhoven, 3,548,244 12/1970 Fenn ..313/316 x Netherlands3,209,188 9/1965 Freeman ..313/318 X 3,469,140 9/1969 Bottone et a1...313/3l7 X [73] Assgnee' g' g corpommn New 2,572,055 10/1951 Saldarini..3l3/3l8 x 1 3,084,274 4/1963 Krey ..313/283 x [22] Filed; Man 25, 1971Primary Examiner-David Schonberg Assistant ExaminerPau1 A. Sacher [2]]Appl- 128,342 Attorney-Frank R. Trifari [30] Foreign ApplicationPriority Data [57] ABSTRACT Apr. 11, 1970 Netherlands .....7005232elecmc filament gas F Y lamp a tubular glass lamp vessel wh1ch 1s sealedat one end by a pinch seal and has a number of filaments or elec- [52]US. Cl. ..3l3/243, 313/271, 313/272, trodes supported by stiff currentconductors or mem- 313/275, 313/316, 313/317, 313/331 bers. Theconductors or members are passed through [51] lnt.C|. ..H0lj l/88, HOljl/92, HOlj 5/02 a common transverse support and are secured to a [58]Field of Search ..L ..3l3/220, 283, 243, metal foil connection outsideof the pinch seal and preferably in the space of the lamp vessel.

5 Claims, 2 Drawing Figures Patented May 29, 1973 2 Sheets-Sheet 1 f V 1m 722347 22? Z INVENTOR.

JOHAN E. L.C. HUYSKENS BY h ,e.

AGE

Patented May 29, 1973 3,736,454

2 Sheets-Sheet 2 INVENTOR.

JOHAN E. L. C. HUYSKENS b/fiW AGENT gas discharge lamp which comprises atubular glass lam'p vessel which is sealed on at least one end by apinch seal, in which vessel one or more filaments or electrodes andpossibly a reflecting screen are arranged which are secured to stiffcurrent conductors and/or supporting members passed through a commonsupport and each secured at their one end to metal sealing foils sealedin the pinch seal, the support being secured in a few places of itscircumference to the side wall of the lamp vessel. Such a lamp isdescribed in the previously filed Dutch patent application 7,004,939.

According to the invention described in the above patent application itis'pro'posed to secure the common support to the side wall of the lampvessel, preferably by means of a seal. The resulting lamp is lesssensitive to vibrations than a lamp in which said support, which bearson a few pole wires projecting from the pinch seal, can move. 1

In the above lamp a number of stiff conductors extend parallel to eachother between the support and the pinch seal and they are welded tosealing foils embedded in the pinch seal.

The conductors extending between the support and the pinch sealsometimes turn out to be subject to a rather large mechanical stresswhich sometimes results in fracture. This may be the case, for example,when during the pinching operation the squeezing members are not movedtruly perpendicularly relative to the longitudinal dimension of anelongate support. In that case a pinch seal is obtained the pinchsurfaces of which can assume a slightly twisted position relative to thesaid support. This is also occurs when, in the case of an elongatesupport, the lead-in members in said support are not all of them locatedin the same plane.

According to the invention, this sometimes occurring drawback can beavoided by not fully embedding the foils in the pinch seal, but causingthem to extend to in the lamp space, the connection place between a curvrent conductor or supporting member and a foil being located outside thepinch seal. It has been found that by arranging the foils in this mannerthey can better withstand the occurring forces of deformation, due totheir flexibility, than foils which are embedded-entirely in the pinchseal.

In order that the invention may be readily carried into effect, oneembodiment thereof will now-be described briefly with reference to thedrawing, in which FIG. 1 is a longitudinal cross-sectional view of ahalogen twin filament lamp, and

FIG. 2 is a cross-sectional view taken on the line lI-ll of FIG. 1.

Reference numeral 1 denotes a lamp vessel of quartz glass in which asupport 3 having continuous stiff current conductors 5, 7 and. 9 ofmolybdenum is sealed to the re-entrant wall parts 11 and 13 obtained bydeformation. Filaments l5 and 17 of tungsten are secured to saidconductors. The filament 15 is welded in addition to a reflecting screen19 of molybdenum. Once an assembly of conductors and filaments ismounted on the support 3, it assumes, when the sealing between thesupport 3 and the side wall of the lamp vessel 1 is carried out, aprescribed position relative to said lamp vessel l, which position isnot changed in the pinch seal 21 to be formed subsequently.

I In the lamp according to the invention, the sealing foils 23, 25 and27 which are normally incorporated in the pinch seal 21, project in thelamp space between the support 3 and the pinch seal 21 in the mannershown, namely over such a length that the place of the weld between theconductor and the foil is likewise present in said space. It has beenfound that in a formed pinch seal the projecting flexible foil partsthen take up a rather large force of deformation; the stresses occurringas a result of the performed pinching operation then produces a smallerreject percentage due'to fracture than in the case of a'foil sealedentirely in the pinch seal.

The invention may also be used in gas discharge lamps provided with apinch seal in which a support secured to the lamp vessel does notcomprise a filament but one or more electrodes. In such a gas dischargelamp, the lamp comprises a tubular glass lamp vessel which is sealed onat least one end by a pinch seal. A transverse common support ispositioned within the lamp vessel and separated from the pinch seal by alamp space. The vessel has at least one electrode of the discharge lampbeing secured to acurrent conductor at one end thereof, the currentconductor passing through the common support and being connected to ametal sealing foil at the other end thereof. The common support issecured to the side wall of the lamp vessel in at least two places ofits circumference. The foil secured in the pinch seal extends into thelamp space and the place of connection between a current conductor andfoil is located within the lamp space.

What is claimed is: I

1. A filament lamp which comprises a tubular glass lamp vessel which issealed on at least one end by a pinch seal, said vessel having at leastone filament of said lamp secured to a current conductor at'one endthereof, a transverse common support being positioned within said lampvessel and separated from said pinch seal by a lamp space, said currentconductor passing through said common support and being connected to ametal sealing foil at the other end thereof, the common support beingsecured to the side wall of the lamp vessel in at least two places ofits circumference, wherein the foil secured in the pinch seal extendsinto the lamp space, the place of connection between a current conductorand a foil being located within the lamp space. I 2. The electricfilament lamp of claiml wherein said conducting member is also asupporting member.

3. The electric lamp as claimed in claim 1 wherein said filament alsoincludes a reflecting screen.

4. A gas discharge lamp which comprises a tubular glass lamp vesselwhich is sealed on at least one end by a pinch seal, a transverse commonsupport being positioned within said lamp vessel and separated from saidpinch seal by a lamp space, said vessel having at least one electrode ofsaid discharge lamp being secured to a current conductor at one endthereof, said current conductor passing through said common support andbeing connected to a metal sealing foil at the other end thereof, thecommon support being secured to the side wall of the lamp vessel in atleast two places of its circumference, wherein the foil secured in thepinch seal extends into the lamp space, the place of connection betweena current conductor and a foil being located within the lamp space.

5. The gas discharge lamp of claim 4 wherein said conducting member isalso a supporting member.

1. A filament lamp which comprises a tubular glass lamp vessel which issealed on at least one end by a pinch seal, said vessel having at leastone filament of said lamp secured to a current conductor at one endthereof, a transverse common support being positioned within said lampvessel and separated from said pinch seal by a lamp space, said currentconductor passing through said common support and being connected to ametal sealing foil at the other end thereof, the common support beingsecured to the side wall of the lamp vessel in at least two places ofits circumference, wherein the foil secured in the pinch seal extendsinto the lamp space, the place of connection between a current conductorand a foil being located within the lamp space.
 2. The electric filamentlamp of claim 1 wherein said conducting member is also a supportingmember.
 3. The electric lamp as claimed in claim 1 wherein said filamentalso includes a reflecting screen.
 4. A gas discharge lamp whichcomprises a tubular glass lamp vessel which is sealed on at least oneend by a pinch seal, a transverse common support being positioned withinsaid lamp vessel and separated from said pinch seal by a lamp space,said vessel having at least one electrode of said discharge lamp beingsecured to a current conductor at one end thereof, said currentconductor passing through said common support and being connected to ametal sealing foil at the other end thereof, the common support beingsecured to the side wall of the lamp vessel in at least two places ofits circumference, wherein the foil secured in the pinch seal extendsinto the lamp space, the place of connection between a current conductorand a foil being located within the lamp space.
 5. The gas dischargelamp of claim 4 wherein said conducting member is also a supportingmember.